问题

er, an inexperienced rider, was found sitting on the bicycle ______tobalance it.

A:having tried
B:trying
C:totry
D:tried

正确答案是：

同类题型

The college student is helping the boy with his homework. How _______ he is!

Could you tell me_______ —More than a year.

Did Peter come to school last week— No, I didn’t know ___________.

下列各句中，划横线的成语使用恰当的一项是（）

How long do you suppose it is he arrived here? —A week or so